My all original unmolested car may not be so original...

So I was doing motor mounts today and when I pulled the broken one out, I noticed that it was completely different from the one 225 slant motor mount I bought.
My theory is at one point, the original 225 was blown up and the previous owners could not afford another 225 so they bought a crappy 198 to put in. This would explain the 198 motor mounts in my "225" car. It would also explain the casting numbers on the side of the block being off.
PXL_20210819_032854676.jpg
Do any of the casting number guru's tell me what engine I have in here?
Thank you